Jack.



s. E. MOORE.

A JACK.

APPLICATION FILED APR-.26| i915.

Patented Feb. 15, 1916.

IML I\\\\\\\\\\\\\\\\\\\ SAMUEL E MmRE.

sAMuEL E. Moons, or vwrLLmMsvrLLE. ILLINOIS.

Spcication of Letters Patent. Patented Feb. i5, 1916.

Application filed -April 26, 19.15. vSerial No. 23,897.

To all whom-#may concern: -K

Be it known that I, SAMUEL E. Moonn, a' citizen of the United States,residing at lNilliamswille, in the county of Sangamon fand tate ofIllinois, have invented a new vand useful Improvement in Jacks, of whichthe following is aspeciication. n

The invention relates to Jacks of the type which embody a stand, arotative -screw and a bushing or sleeve co-acting with the screw.

The general purpose of the invention is to provide a strong andeifective jack which may be made at a low first oost and will not besubject to breaking or injury by reason of turning the screw too farupward.

More specific purposes are: to provide' in connection with the stand, abushing nor-v mally at rest and adapted to sustain-the screw, butcapable of rotation with the screw; to provide a latch on the stand-nor`mally effective to hold the bushing at rest clutch member having acircular series of v and adapted to be released-to permit rotation ofthe bushing; to provide a controlling device in connection with thescrew and .effective to operate the latch before the screw reaches ythelimit of its upward movement; to provide clutch members on the screw andthe bushing, adapted to engage with each other to`cause the bushing torotate with the screw and thereby prevent excessive upward mo vement ofthe screw; and to provide means to prevent the rotation of the bushingduring the first downward movement of the screw until such time as thelatch comes into action. I

The invention is illustrated in the annexed drawing, to whichreferenceis hereby made. "Figure 1 is a partial vertical longitudinal sectionthrough a jack embodying my invention, the screw being showninelevation.`

lFig. 2 is a .horizontal 'transverse section through the jack on theline.X..X. of Fig. 1. Fig. 3 is a horizontal transverse section throughthe jack on the line Y. Y. of Fig. 1, and F ig. at is a horizontaltransverse section 'through the stand and the screw on the line yz. f.of rig. 1.

rimilar reference characters designate like parte in the differentviews. he main structure 1s preferably of cast iron, but any othersuitable material'may be used.'

The stand 1 is preferably ,of the form shown, having a wide base, la.Vhas in its upper part, a longitudinal circular bore 1f, radial to thestand.

The stand integral with the bushingand having a circular seriesof'inclined teeth 2. The bushing also has a circumferential groove 2d, acircumferential series of notches 2e and a central longitudinal bore 2fhaving integral screw threads 2g matching thethreads of the screw 3. Thescrew 3 has threads 3, matching thethreads 2F, and transverse holes 3bto receive an instrument for turning the Screw. A headl 4 is rptative onthe upper end of the screw 3. f A disk 5 is rigidly .connected with thelower end of the screw 3. On the upper side of the disk is an integralinclined vteeth 5l adapted to engage with the teeth 2c at the lower endof the bushing 2. 'A Apin 6 extending transversely through v the upperpart of the stand 1 is approXi` mately tangential to the innercircumference' of the circular groove 2d. The pin prevents longitudinalmovement of the bushing. The l -adaptedA to engage in the notches 2e ofthe bushing 2 to prevent rotation of thebushing. A spring 8 acts on thelatch to keep the tongue rWin any one of the notches 2e.

The stand 1 has a boss 1e provided with a The outer end of the boss isscrew threaded. A cap 9 screws onto the b oss 1e andhas a central hole'9L inwhich the stem 12", of the click, slides. The click is preferablyof steel and comprises a blade 12, a piston 12' and a stem 12b,

preferably in one piece. The blade 12 has a latedge 12', adapted tobeengaged by one 2 from turning with the screw 3 during the 'wall of anynotch 2e to prevent the bushing first part of the downward movement ofthe screw, before the clutch teeth 5a become disf. engaged from theteeth 2, and the latch 7 with the screw will engage on the lower infelined edge ot the latch and more the lateh to withdraw the tongue 7bfrom the notch :20, and immediately following' the complete withdrawalof the tongue, the. teeth 5a wilt engage the teeth 2C to cause thebushing to rotate with the screw and prevent any im.

ther upward movement of the screw, thus ads of ht repreventing thestripping of the thre the screw or other accident whicl sult fromexcessive upward turning ot the During; this rotation ot the bushing thewalls ot the notches 2f will engage the inclined edge 12" ot theblade lte cause retraction of the click so that the ciielt will not prevent thebushing from rotating.,r in the direction indicated by the arrow W,fie'. i. Upon starting; the screw to turn downward, there is risk thatthe screw might Stiel( in the bushino' so that the bushing would turnwith the screw and thus prevent disengagef ment ot' the teeth 5 from theteeth 2C, 1t some means were not provided to obviate this diiiiculty. Itthe screw should stick in the bushing, the iirst partial rotation ot thebushingin the direction indirated b v the arrow V, Fig'. Q, would causethe wall oit the nearest notch 2, approaching the click. to strikeagainst the [iat edge l2 ot the blade l2, and thus stop the rotation.

Having' fullj,7 described my invention. what I claim as new and desireto secure by Letters Patent is:

l. In a jack, the combination ot' a stand.,

a bushing adapted to rotate in the stand, a

screw rotative in the bushing, a holding de.

ward turning oi. the screw, and means -for reieasing said holding devicete permit the bushing` to rotate with the screw.

2. in a jack, the combination ot a stand,

a bushing rotatiw clockwise and counter nig and. engaging' therefith tocanse the- Siflew and the bushing to rotate together.

4.' lin a jack, the combination ot a stand, a onshlxg mounted on androtative in the stand and having a circumferential series of notches,` alatch adapted to engagel in any notch of said series of notches toprevent rotation of the bushing` in either direction;

means for releasing said latch;v and a click adapted'fto engage in anynotch of said series of notches to stop rotation of the bushing in onedirection when the latchgis dis engaged and adapted to permit rotationof the bushing in the opposite direction when the latch is disengaged.

ln a jack, the combination of a stand, a bushing mounted on the upperend of the stand and rotative in the stand and l'iaving 'aciremnferential series of notches, and als having,- a clutch member, alatch adapted to engage in any notch oi said series of notches, a screwrotative in the bushing, and a disk connected with the screw and havin ga clutch member eomplemental to the clutch member of the bushing, saiddisk being effective to release the latch immediately before conipleteengagement of the clutch members.

In witness-whereof, I have hereunto signed my name, at Springiield,Illinois, this 211th day of February 1915. l

SAMUEL E. MOORE.

llitnesses i ARTHUR L. PoonMAN, 'HAZEL E. Sturm. l

